The 3rd-generation Nest thermostat learns the temperatures that you like, turns itself down when you're out and connects to your phone. It has a big, sharp display. It controls your hot water tank. And it helps save energy. That's the most beautiful part.
The Nest thermostat uses built-in sensors and your phone's location to confirm that no one's at home. So when you leave, it turns itself down and saves energy. And you can always check your Energy History to see how much heating you've used or change the temperature with the Nest app.